How to Evaluate a TES Tank Supplier: Capability Checklist Before You Buy

A thermal energy storage (TES) tank is a long-life asset, so the supplier you choose matters more than the headline price. Whether you need a stratified chilled-water tank for a plant or a large buffer for a campus, the evaluation should start with demonstrated capability, not a brochure. This article is a capability checklist you can run before issuing a request for quotation.

Scale is the first filter because it predicts whether a supplier can actually deliver your volume. Ask for the largest single tank and the total volume delivered, and whether they repeat modular panels. Our Sardinia tank (30,549 m3, 2025), Indonesia Cilincing tank (21,088 m3, 2024), and Namibia array (6 x 11,230 m3, 2022) show repeatable large coated-tank delivery across three continents.

• Largest single tank built.
• Total volume delivered.
• Modular repeatability.
• Scale predicts deliverability.

For chilled or process water the lining is the life-limiting item. Require glass-fused-to-steel (GFS, fired at 820-930 C) or fusion-bonded-epoxy (FBE) with a holiday-test record and a documented chemical-resistance list. A supplier without retained coating QA is a risk regardless of tank size.

• GFS fired 820-930 C or FBE.
• Holiday-test record required.
• Documented chemical-resistance list.
• Coating QA is the real gate.

Confirm the supplier designs to AWWA D103 and ISO 28765 for bolted water tanks and can show wind and seismic calculations. For a pressurized TES vessel, ASME Section VIII enters and the U-stamp scope must be confirmed per project. Design discipline, not just fabrication, protects the asset.

• AWWA D103 + ISO 28765.
• Wind and seismic calculations.
• ASME where pressurized.
• Design protects the asset.

Flat-pack panel shipping and local erection keep a tank build off the mechanical critical path. Confirm customs documentation and local crew or EPC support. A supplier with long, rigid lead times puts your whole schedule at risk, so the delivery model is part of the capability assessment.

• Flat-pack panel shipping.
• Customs documentation.
• Local crew or EPC support.
• Lead time is a capability.

We have no TES or data-center project in this library. The large coated tanks we cite (Sardinia 30,549 m3, Cilincing 21,088 m3, Namibia 67,380 m3) are analogous industrial and utility deliveries, not TES or data-center projects, offered as evidence of our manufacturing scale and delivery capability.

• No TES / DC project in library.
• Citations analogous, not claims.
• Scale and delivery are real.
• Verify our references too.

Demonstrated scale: the largest tank built, total volume delivered, and whether they repeat modular panels, because that predicts whether they can deliver your project.

For chilled or process water the lining limits tank life, so require GFS or FBE with a holiday-test record and a chemical-resistance list, or the tank fails early regardless of size.

AWWA D103 and ISO 28765 for bolted water tanks, with wind and seismic calculations; ASME Section VIII where the tank is a pressure vessel.

Flat-pack panels for shipping efficiency and local erection for schedule; avoid suppliers with long, rigid lead times that put your project at risk.

No, for a real evaluation they should be verifiable projects you can confirm, not generic claims in a brochure.

Not in our project library. We cite large coated tanks at other clients as analogous capability, not TES or data-center deliveries.

Evaluating a TES tank supplier starts with universal criteria, scale, coating QA, design standards, and delivery model, before any application-specific checks. The lining is the real gate because it limits tank life, so require a holiday-tested GFS or FBE surface with a chemical-resistance list. Once you have a capable shortlist, then specialize to ASME, data-center redundancy, or your specific loop. Verify references rather than trusting claims, and the supplier field sorts itself.